1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2013 Facebook. All rights reserved.
4 */
5
6 #include <linux/types.h>
7 #include "btrfs-tests.h"
8 #include "../ctree.h"
9 #include "../transaction.h"
10 #include "../disk-io.h"
11 #include "../qgroup.h"
12 #include "../backref.h"
13 #include "../fs.h"
14 #include "../accessors.h"
15
16 static int insert_normal_tree_ref(struct btrfs_root *root, u64 bytenr,
17 u64 num_bytes, u64 parent, u64 root_objectid)
18 {
19 struct btrfs_trans_handle trans;
20 struct btrfs_extent_item *item;
21 struct btrfs_extent_inline_ref *iref;
22 struct btrfs_tree_block_info *block_info;
23 struct btrfs_path *path;
24 struct extent_buffer *leaf;
25 struct btrfs_key ins;
26 u32 size = sizeof(*item) + sizeof(*iref) + sizeof(*block_info);
27 int ret;
28
29 btrfs_init_dummy_trans(&trans, NULL);
30
31 ins.objectid = bytenr;
32 ins.type = BTRFS_EXTENT_ITEM_KEY;
33 ins.offset = num_bytes;
34
35 path = btrfs_alloc_path();
36 if (!path) {
37 test_std_err(TEST_ALLOC_ROOT);
38 return -ENOMEM;
39 }
40
41 ret = btrfs_insert_empty_item(&trans, root, path, &ins, size);
42 if (ret) {
43 test_err("couldn't insert ref %d", ret);
44 btrfs_free_path(path);
45 return ret;
46 }
47
48 leaf = path->nodes[0];
49 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
50 btrfs_set_extent_refs(leaf, item, 1);
51 btrfs_set_extent_generation(leaf, item, 1);
52 btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_TREE_BLOCK);
53 block_info = (struct btrfs_tree_block_info *)(item + 1);
54 btrfs_set_tree_block_level(leaf, block_info, 0);
55 iref = (struct btrfs_extent_inline_ref *)(block_info + 1);
56 if (parent > 0) {
57 btrfs_set_extent_inline_ref_type(leaf, iref,
58 BTRFS_SHARED_BLOCK_REF_KEY);
59 btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
60 } else {
61 btrfs_set_extent_inline_ref_type(leaf, iref, BTRFS_TREE_BLOCK_REF_KEY);
62 btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid);
63 }
64 btrfs_free_path(path);
65 return 0;
66 }
67
68 static int add_tree_ref(struct btrfs_root *root, u64 bytenr, u64 num_bytes,
69 u64 parent, u64 root_objectid)
70 {
71 struct btrfs_trans_handle trans;
72 struct btrfs_extent_item *item;
73 struct btrfs_path *path;
74 struct btrfs_key key;
75 u64 refs;
76 int ret;
77
78 btrfs_init_dummy_trans(&trans, NULL);
79
80 key.objectid = bytenr;
81 key.type = BTRFS_EXTENT_ITEM_KEY;
82 key.offset = num_bytes;
83
84 path = btrfs_alloc_path();
85 if (!path) {
86 test_std_err(TEST_ALLOC_ROOT);
87 return -ENOMEM;
88 }
89
90 ret = btrfs_search_slot(&trans, root, &key, path, 0, 1);
91 if (ret) {
92 test_err("couldn't find extent ref");
93 btrfs_free_path(path);
94 return ret;
95 }
96
97 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
98 struct btrfs_extent_item);
99 refs = btrfs_extent_refs(path->nodes[0], item);
100 btrfs_set_extent_refs(path->nodes[0], item, refs + 1);
101 btrfs_release_path(path);
102
103 key.objectid = bytenr;
104 if (parent) {
105 key.type = BTRFS_SHARED_BLOCK_REF_KEY;
106 key.offset = parent;
107 } else {
108 key.type = BTRFS_TREE_BLOCK_REF_KEY;
109 key.offset = root_objectid;
110 }
111
112 ret = btrfs_insert_empty_item(&trans, root, path, &key, 0);
113 if (ret)
114 test_err("failed to insert backref");
115 btrfs_free_path(path);
116 return ret;
117 }
118
119 static int remove_extent_item(struct btrfs_root *root, u64 bytenr,
120 u64 num_bytes)
121 {
122 struct btrfs_trans_handle trans;
123 struct btrfs_key key;
124 struct btrfs_path *path;
125 int ret;
126
127 btrfs_init_dummy_trans(&trans, NULL);
128
129 key.objectid = bytenr;
130 key.type = BTRFS_EXTENT_ITEM_KEY;
131 key.offset = num_bytes;
132
133 path = btrfs_alloc_path();
134 if (!path) {
135 test_std_err(TEST_ALLOC_ROOT);
136 return -ENOMEM;
137 }
138
139 ret = btrfs_search_slot(&trans, root, &key, path, -1, 1);
140 if (ret) {
141 test_err("didn't find our key %d", ret);
142 btrfs_free_path(path);
143 return ret;
144 }
145 btrfs_del_item(&trans, root, path);
146 btrfs_free_path(path);
147 return 0;
148 }
149
150 static int remove_extent_ref(struct btrfs_root *root, u64 bytenr,
151 u64 num_bytes, u64 parent, u64 root_objectid)
152 {
153 struct btrfs_trans_handle trans;
154 struct btrfs_extent_item *item;
155 struct btrfs_path *path;
156 struct btrfs_key key;
157 u64 refs;
158 int ret;
159
160 btrfs_init_dummy_trans(&trans, NULL);
161
162 key.objectid = bytenr;
163 key.type = BTRFS_EXTENT_ITEM_KEY;
164 key.offset = num_bytes;
165
166 path = btrfs_alloc_path();
167 if (!path) {
168 test_std_err(TEST_ALLOC_ROOT);
169 return -ENOMEM;
170 }
171
172 ret = btrfs_search_slot(&trans, root, &key, path, 0, 1);
173 if (ret) {
174 test_err("couldn't find extent ref");
175 btrfs_free_path(path);
176 return ret;
177 }
178
179 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
180 struct btrfs_extent_item);
181 refs = btrfs_extent_refs(path->nodes[0], item);
182 btrfs_set_extent_refs(path->nodes[0], item, refs - 1);
183 btrfs_release_path(path);
184
185 key.objectid = bytenr;
186 if (parent) {
187 key.type = BTRFS_SHARED_BLOCK_REF_KEY;
188 key.offset = parent;
189 } else {
190 key.type = BTRFS_TREE_BLOCK_REF_KEY;
191 key.offset = root_objectid;
192 }
193
194 ret = btrfs_search_slot(&trans, root, &key, path, -1, 1);
195 if (ret) {
196 test_err("couldn't find backref %d", ret);
197 btrfs_free_path(path);
198 return ret;
199 }
200 btrfs_del_item(&trans, root, path);
201 btrfs_free_path(path);
202 return ret;
203 }
204
205 static int test_no_shared_qgroup(struct btrfs_root *root,
206 u32 sectorsize, u32 nodesize)
207 {
208 struct btrfs_backref_walk_ctx ctx = { 0 };
209 struct btrfs_trans_handle trans;
210 struct btrfs_fs_info *fs_info = root->fs_info;
211 struct ulist *old_roots = NULL;
212 struct ulist *new_roots = NULL;
213 int ret;
214
215 btrfs_init_dummy_trans(&trans, fs_info);
216
217 test_msg("running qgroup add/remove tests");
218 ret = btrfs_create_qgroup(&trans, BTRFS_FS_TREE_OBJECTID);
219 if (ret) {
220 test_err("couldn't create a qgroup %d", ret);
221 return ret;
222 }
223
224 ctx.bytenr = nodesize;
225 ctx.trans = &trans;
226 ctx.fs_info = fs_info;
227
228 /*
229 * Since the test trans doesn't have the complicated delayed refs,
230 * we can only call btrfs_qgroup_account_extent() directly to test
231 * quota.
232 */
233 ret = btrfs_find_all_roots(&ctx, false);
234 if (ret) {
235 test_err("couldn't find old roots: %d", ret);
236 return ret;
237 }
238 old_roots = ctx.roots;
239 ctx.roots = NULL;
240
241 ret = insert_normal_tree_ref(root, nodesize, nodesize, 0,
242 BTRFS_FS_TREE_OBJECTID);
243 if (ret) {
244 ulist_free(old_roots);
245 return ret;
246 }
247
248 ret = btrfs_find_all_roots(&ctx, false);
249 if (ret) {
250 ulist_free(old_roots);
251 test_err("couldn't find old roots: %d", ret);
252 return ret;
253 }
254 new_roots = ctx.roots;
255 ctx.roots = NULL;
256
257 ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
258 new_roots);
259 if (ret) {
260 test_err("couldn't account space for a qgroup %d", ret);
261 return ret;
262 }
263
264 /* btrfs_qgroup_account_extent() always frees the ulists passed to it. */
265 old_roots = NULL;
266 new_roots = NULL;
267
268 if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID,
269 nodesize, nodesize)) {
270 test_err("qgroup counts didn't match expected values");
271 return -EINVAL;
272 }
273
274 ret = btrfs_find_all_roots(&ctx, false);
275 if (ret) {
276 test_err("couldn't find old roots: %d", ret);
277 return ret;
278 }
279 old_roots = ctx.roots;
280 ctx.roots = NULL;
281
282 ret = remove_extent_item(root, nodesize, nodesize);
283 if (ret) {
284 ulist_free(old_roots);
285 return -EINVAL;
286 }
287
288 ret = btrfs_find_all_roots(&ctx, false);
289 if (ret) {
290 ulist_free(old_roots);
291 test_err("couldn't find old roots: %d", ret);
292 return ret;
293 }
294 new_roots = ctx.roots;
295 ctx.roots = NULL;
296
297 ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
298 new_roots);
299 if (ret) {
300 test_err("couldn't account space for a qgroup %d", ret);
301 return -EINVAL;
302 }
303
304 if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID, 0, 0)) {
305 test_err("qgroup counts didn't match expected values");
306 return -EINVAL;
307 }
308
309 return 0;
310 }
311
312 /*
313 * Add a ref for two different roots to make sure the shared value comes out
314 * right, also remove one of the roots and make sure the exclusive count is
315 * adjusted properly.
316 */
317 static int test_multiple_refs(struct btrfs_root *root,
318 u32 sectorsize, u32 nodesize)
319 {
320 struct btrfs_backref_walk_ctx ctx = { 0 };
321 struct btrfs_trans_handle trans;
322 struct btrfs_fs_info *fs_info = root->fs_info;
323 struct ulist *old_roots = NULL;
324 struct ulist *new_roots = NULL;
325 int ret;
326
327 btrfs_init_dummy_trans(&trans, fs_info);
328
329 test_msg("running qgroup multiple refs test");
330
331 /*
332 * We have BTRFS_FS_TREE_OBJECTID created already from the
333 * previous test.
334 */
335 ret = btrfs_create_qgroup(&trans, BTRFS_FIRST_FREE_OBJECTID);
336 if (ret) {
337 test_err("couldn't create a qgroup %d", ret);
338 return ret;
339 }
340
341 ctx.bytenr = nodesize;
342 ctx.trans = &trans;
343 ctx.fs_info = fs_info;
344
345 ret = btrfs_find_all_roots(&ctx, false);
346 if (ret) {
347 test_err("couldn't find old roots: %d", ret);
348 return ret;
349 }
350 old_roots = ctx.roots;
351 ctx.roots = NULL;
352
353 ret = insert_normal_tree_ref(root, nodesize, nodesize, 0,
354 BTRFS_FS_TREE_OBJECTID);
355 if (ret) {
356 ulist_free(old_roots);
357 return ret;
358 }
359
360 ret = btrfs_find_all_roots(&ctx, false);
361 if (ret) {
362 ulist_free(old_roots);
363 test_err("couldn't find old roots: %d", ret);
364 return ret;
365 }
366 new_roots = ctx.roots;
367 ctx.roots = NULL;
368
369 ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
370 new_roots);
371 if (ret) {
372 test_err("couldn't account space for a qgroup %d", ret);
373 return ret;
374 }
375
376 if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID,
377 nodesize, nodesize)) {
378 test_err("qgroup counts didn't match expected values");
379 return -EINVAL;
380 }
381
382 ret = btrfs_find_all_roots(&ctx, false);
383 if (ret) {
384 test_err("couldn't find old roots: %d", ret);
385 return ret;
386 }
387 old_roots = ctx.roots;
388 ctx.roots = NULL;
389
390 ret = add_tree_ref(root, nodesize, nodesize, 0,
391 BTRFS_FIRST_FREE_OBJECTID);
392 if (ret) {
393 ulist_free(old_roots);
394 return ret;
395 }
396
397 ret = btrfs_find_all_roots(&ctx, false);
398 if (ret) {
399 ulist_free(old_roots);
400 test_err("couldn't find old roots: %d", ret);
401 return ret;
402 }
403 new_roots = ctx.roots;
404 ctx.roots = NULL;
405
406 ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
407 new_roots);
408 if (ret) {
409 test_err("couldn't account space for a qgroup %d", ret);
410 return ret;
411 }
412
413 if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID,
414 nodesize, 0)) {
415 test_err("qgroup counts didn't match expected values");
416 return -EINVAL;
417 }
418
419 if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FIRST_FREE_OBJECTID,
420 nodesize, 0)) {
421 test_err("qgroup counts didn't match expected values");
422 return -EINVAL;
423 }
424
425 ret = btrfs_find_all_roots(&ctx, false);
426 if (ret) {
427 test_err("couldn't find old roots: %d", ret);
428 return ret;
429 }
430 old_roots = ctx.roots;
431 ctx.roots = NULL;
432
433 ret = remove_extent_ref(root, nodesize, nodesize, 0,
434 BTRFS_FIRST_FREE_OBJECTID);
435 if (ret) {
436 ulist_free(old_roots);
437 return ret;
438 }
439
440 ret = btrfs_find_all_roots(&ctx, false);
441 if (ret) {
442 ulist_free(old_roots);
443 test_err("couldn't find old roots: %d", ret);
444 return ret;
445 }
446 new_roots = ctx.roots;
447 ctx.roots = NULL;
448
449 ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
450 new_roots);
451 if (ret) {
452 test_err("couldn't account space for a qgroup %d", ret);
453 return ret;
454 }
455
456 if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FIRST_FREE_OBJECTID,
457 0, 0)) {
458 test_err("qgroup counts didn't match expected values");
459 return -EINVAL;
460 }
461
462 if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID,
463 nodesize, nodesize)) {
464 test_err("qgroup counts didn't match expected values");
465 return -EINVAL;
466 }
467
468 return 0;
469 }
470
471 int btrfs_test_qgroups(u32 sectorsize, u32 nodesize)
472 {
473 struct btrfs_fs_info *fs_info = NULL;
474 struct btrfs_root *root;
475 struct btrfs_root *tmp_root;
476 int ret = 0;
477
478 fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
479 if (!fs_info) {
480 test_std_err(TEST_ALLOC_FS_INFO);
481 return -ENOMEM;
482 }
483
484 root = btrfs_alloc_dummy_root(fs_info);
485 if (IS_ERR(root)) {
486 test_std_err(TEST_ALLOC_ROOT);
487 ret = PTR_ERR(root);
488 goto out;
489 }
490
491 /* We are using this root as our extent root */
492 root->root_key.objectid = BTRFS_EXTENT_TREE_OBJECTID;
493 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
494 root->root_key.offset = 0;
495 btrfs_global_root_insert(root);
496
497 /*
498 * Some of the paths we test assume we have a filled out fs_info, so we
499 * just need to add the root in there so we don't panic.
500 */
501 root->fs_info->tree_root = root;
502 root->fs_info->quota_root = root;
503 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
504
505 /*
506 * Can't use bytenr 0, some things freak out
507 * *cough*backref walking code*cough*
508 */
509 root->node = alloc_test_extent_buffer(root->fs_info, nodesize);
510 if (IS_ERR(root->node)) {
511 test_err("couldn't allocate dummy buffer");
512 ret = PTR_ERR(root->node);
513 goto out;
514 }
515 btrfs_set_header_level(root->node, 0);
516 btrfs_set_header_nritems(root->node, 0);
517 root->alloc_bytenr += 2 * nodesize;
518
519 tmp_root = btrfs_alloc_dummy_root(fs_info);
520 if (IS_ERR(tmp_root)) {
521 test_std_err(TEST_ALLOC_ROOT);
522 ret = PTR_ERR(tmp_root);
523 goto out;
524 }
525
526 tmp_root->root_key.objectid = BTRFS_FS_TREE_OBJECTID;
527 root->fs_info->fs_root = tmp_root;
528 ret = btrfs_insert_fs_root(root->fs_info, tmp_root);
529 if (ret) {
530 test_err("couldn't insert fs root %d", ret);
531 goto out;
532 }
533 btrfs_put_root(tmp_root);
534
535 tmp_root = btrfs_alloc_dummy_root(fs_info);
536 if (IS_ERR(tmp_root)) {
537 test_std_err(TEST_ALLOC_ROOT);
538 ret = PTR_ERR(tmp_root);
539 goto out;
540 }
541
542 tmp_root->root_key.objectid = BTRFS_FIRST_FREE_OBJECTID;
543 ret = btrfs_insert_fs_root(root->fs_info, tmp_root);
544 if (ret) {
545 test_err("couldn't insert fs root %d", ret);
546 goto out;
547 }
548 btrfs_put_root(tmp_root);
549
550 test_msg("running qgroup tests");
551 ret = test_no_shared_qgroup(root, sectorsize, nodesize);
552 if (ret)
553 goto out;
554 ret = test_multiple_refs(root, sectorsize, nodesize);
555 out:
556 btrfs_free_dummy_root(root);
557 btrfs_free_dummy_fs_info(fs_info);
558 return ret;
559 }
560
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